Radar system

1. A radar system comprising: a power amplifier and a mixer, wherein the power amplifier and the mixer are not discrete components but are integrated in a common semiconductor chip, wherein the power amplifier includes the mixer as a functional part thereof, and the mixer comprises at least a diode, the diode being a semiconductor element of both the power amplifier and the mixer.

2. The radar system of claim 1 , wherein the power amplifier includes a MOSFET and wherein the diode comprises an inherent diode of the MOSFET.

3. The radar system of claim 1 , wherein: the power amplifier includes a transistor having a gate, a source, and a drain, the transistor includes the diode, the diode extending between the drain and the source of the transistor with a cathode of the diode corresponding to the drain of the transistor, the transistor is configured to amplify a first signal received at the gate, and the diode is configured to mix the first signal with a second signal received at the drain.

4. A radar system comprising at least a high frequency generator connected to a power amplifier, a mixer, an antenna, and a processing unit, wherein the power amplifier, the mixer, the antenna and the processing unit are not discrete components but are integrated in a common semiconductor chip and wherein the power amplifier, the mixer, the antenna and the processing unit are connected to a common high frequency node, and wherein the mixer comprises a semiconductor element with a nonlinear electrical characteristic, and wherein the semiconductor element comprises at least a diode.

5. The radar system according to claim 4 , wherein the processing unit comprises at least a lowpass filter, an A/D converter and a digital signal processor.

6. The radar system according to claim 4 , wherein the power amplifier and the mixer are integrated in a common semiconductor chip.

7. The radar system according to claim 6 , wherein the antenna is integrated in the common semiconductor chip.

8. The radar system according to claim 6 , wherein the high frequency generator is integrated in the common semiconductor chip.

9. A radar system comprising at least a high frequency generator connected to a power amplifier, a mixer, an antenna, and a processing unit, wherein the power amplifier, the mixer, the antenna and the processing unit are not discrete components but are integrated in a common semiconductor chip and wherein the power amplifier, the mixer, the antenna and the processing unit are connected to a common high frequency node, and wherein the mixer comprises a semiconductor element with a nonlinear electrical characteristic, and wherein the semiconductor element comprises at least a diode, and wherein the power amplifier comprises the mixer.